For those of you who doubt the capabilities of the iPhone 4 for photo taking and editing, the cover of the September issue of Macworld is made entirely on an iPhone 4.

Macworld's contributing photographer, Peter Selanger, who has "shot almost every photograph in the pages of the magazine over the past few years", had apparently been "tinkering with the idea of shooting a Macworld cover with an iPhone for some time". When he saw that the iPhone 4 was going to have a high-quality 5 megapixel camera, the time became now.

Using only the regular camera (no soldered on lens of any kind) and two apps, Perer was able to make a high quality shot, pretty enough for a cover, of none other than the iPhone 4 itself.

“For the most part, my strategy for photographing the cover didn’t change from how I normally would shoot,” Peter says in a blog post about the process. “I still had my normal set with lots of lights, flags and stands. I did have to change my light source from strobes to tungsten lights because the iPhone can’t sync with studio strobes."

“The iPhone’s Retina display was truly awesome,” he says. “I was really able to see the detail in the photo as I was shooting. It made me wish Apple produced all its monitors this way. The final photo was dust-free and looked great. I was extremely impressed with the detail that the iPhone was able to capture.”

In case anyone wants to know, Peter used PhotoForge for some minor color correcting and Resize-Photo to make the shot large enough for the magazine cover.